US Bridges

Lrd Lapham ST over Oconomowoc River

Poor

Waukesha County, Wisconsin · 0.9M S JCT Cth Z · Structure no. P67077000000000

Built
1950
75 years old, rebuilt 1989
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
42 ft
1 main span
Daily traffic
101
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Lrd Lapham ST over Oconomowoc River is a steel stringer/multi-beam or girder carrying Lrd Lapham ST over Oconomowoc River in Waukesha County, Wisconsin. It was built in 1950 and reconstructed in 1989, so it is 75 years old, older than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 101 vehicles a day, projected to reach 111 by 2043. The structure is 42 ft (12.9 m) long and 15 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesLrd Lapham ST
CrossesOconomowoc River
Location0.9M S JCT Cth Z
RouteCity Street 0
Coordinates43.11552, -88.48563
Functional classUrban Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating37.8 US tons
Inventory rating21.4 US tons

Structure

MaterialSteel
DeckOpen grating
Main spans1
Design loadH 20
Structure length42 ft (12.9 m)
Longest span39 ft (11.9 m)
Deck width15 ft (4.5 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic101 (2022)
Projected traffic111 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$247,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lrd Lapham ST over Oconomowoc River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1989.

What condition is Lrd Lapham ST over Oconomowoc River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2024.

How much traffic does Lrd Lapham ST over Oconomowoc River carry?

About 101 vehicles per day (2022 count).

How long is Lrd Lapham ST over Oconomowoc River?

The structure is 42 ft (12.9 m) long with a longest span of 39 ft (11.9 m) and a deck 15 ft wide.

Who owns Lrd Lapham ST over Oconomowoc River?

It is owned by the City or Municipal Highway Agency.